CONSTANT FLOW RATE SAMPLING APPARATUS USING VARIABLE CROSS SECTION CRITICAL FLOW VENTURI TUBE USING MOVABLE VENTURI TUBE

摘要

PURPOSE: To provide a constant flow rate sampling apparatus using a variable cross section critical flow venturi tube in which the fluid pressure loss of a flow passage is small and whose structure is simple. ;CONSTITUTION: A constant flow rate sampling apparatus uses a variable cross section critical flow venturi tube 1 using a movable venturi tube 10 wherein, in a variable cross section sound velocity venturi, a core 3 which is fixed in the central part and whose cross section is changed smoothly along a flow direction is combined with a movable venturi whose position can be set at the outer circumference of the core 3 so as to be movable along the flow direction and the cross section of the flow passage of a throat part 11 is made variable.;COPYRIGHT: (C)1996,JPO